Roller-blind for photographic cameras.



PATBNTBD 001123, 1906.

E. BRAUBURGER.

ROLLER BLIND FOR PHOTOGRAPHIC CAMERAS.

APPLICATION' FILED APB.15, 1905.

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UNITEnfsTATEs ERNST BRAUBURGER, or sTEcLiTz, NEAR BERLIN, GERMANY, ASSIGNoR PATENT OFFICE.

TO THE OPTISGHE A'NS'IALT C.' P. GOERZ 'AKTIENGESELL- SUHAFT, OF FRIEDENAU, NEAR BERLIN, GERMANY.

ROLLER-BLIND Fon 'PHoToGRAPHlc CAMERAS.

Specification of Letters Patent.

Patented oct'. 23, 1906.

Application iiled April 15, 1905. TSerial'lo. 255.787.

To all whom it may-concern:

Be it known that I, ERNST BRAUBURGER, al

i subject'of the German Emperor, and a resident of Steglitz, near Berlin, Germany, have invented 'certain new and useful Improve` ments in 4Roller-Blinds for Photographic Cameras, of which the following is a'specification.

This invention relates to curtain-shutters for photographic cameras in which the size of the slit through which the plate is exposedis regulated by the shifting of two curtains toward or away from each other.

The object of Athe-invention is toattain aI companying drawings.

On the drawings, Figure 1 shows a front View of the shutter and parts of the same in longitudinal section through a roller of the curtain.l Fig. 2 is a side view of the casing of the shutter with the wall of the casing partly broken off. Figs. 3 and 4 show details' of the `(lirevice, Fig. 3 being a section on line 3 3 of Similar numerals refer to similar parts throughout the several yiews.

The two curtains are marked with 1 and 2,. The rolleron which the curtain 1 is wound is marked with 3 while the rollers of the curtain 2 are marked with 4. The spring stretching-l rollerfor the curtain 1 is marked 5; the one` for the curtain 2, 6. The axle of the roller 5 is provided at one end with a knob 105, allowing the tension of the spring of the roller to be regulated at will by rotating the knob 105.. The rollers 4 are locatedcoaxially with the roller 3 and mounted loosely on the end parts 7 kof its axle. The end pieces A7 of the axle of the roller 3. carry also friction bodies 8, which are adapted vto be, pressed with their inner lateral surfaces by springs 9 against the roller 3. The periphery of the disk-hke bodies 8 issuch `that there remains a space 10 be- 4 are' provided at their ends with teeth 13,

which engage with toothed wheels 14. Each toothed wheel. 14 is provided with a pin 15,

which can be made to engage with a rojection 16 on the casing. 17 is a toothe wheel rigidly arranged on the end 7 of the axle of the roller 3. This wheef engages .with a toothed wheel 18, which in its turn engages with a toothed wheel 19 connected with the winding-up handle 20. The toothed Wheel 18 is provided with a pin 21 which can be made to engage with a in 22 on a disk 23. Disk 23 is connected wit a disk 24, provided with divisions 25 and ressed by a spring 26 toward the outside.v y a pressure-on the button 2 7 the, disk' 24, and simultaneously with it the disk 23, connected with it, can be pressed inward, when a pin 28 will step out of one of the openings 29 of the disk 23, so that the disk 24 can be turned. The osition of the disk 24 can at any time be rea on the scale 25 oi' the same byfmeans of the mark 30. On the toothed wheel 19 is arranged a toothed wheel-segment 31, with which the disengaging-le ver 32, with the disengagin knob or button 33, can egage. The teet of the segment 31 lie on an inclined surface, so that at one end of the segment'theyyare at a greater distance from the face of l the toothed wheel 19 than at the other.

34 is a projection provided on the shaft ofI ythetoothed wheel 19, while 35 is a projection 34 and 35. l In another position of the hand 37 the' lever 32 'rejects not only into the path of the teeth o thesegment 31, but also into the path of the projection34, and in a third position, moreover, into the path of-the proj jection 35.

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. In the above description of t The working of. the shutter is as-follows When the device is to be wound up and an exposure to take place, the handle 20 is turned and the winding-up rollers 3 4 rotated thereby, so that the curtains 1 2 are wound upon these rollers. During this movement the roller 3 moves the friction-bodies 8, which in their turn transmit their movement, through the rollers 11, to the windingeup rollers 4. The friction-bodies 8 therefore form a kind of bridge between the rollers 3 and 4, the bridge 8 being coupled as wellwith the roller 3 as with the roller 4 by suitable coupling devices. The rotation of the winding-up rollers of both curtains continues until the pin 15 of the wheel 14 strikes against the projection 16. This stops the further rotation of the rollers 4. If now the handle 20 isturned farther, the curtain 1v is moved farther and displaced with relation to curtain'2 until the projection 21 strikes against the projection 22. l yAccording to the adjustment of the disk 24l the slit between the two blinds 1 2 will be more or less broad. If now the disengaging-lever 32 byV a pressure on the button 33 is moved out of the teeth of the segment 31 ,j the curtains are moved under theaction of the spring stretching-rollers 5 6. Both curtains are moved simultaneously until .the pin 15 of the wheel 14 strikes from the other side against the pin 16, the same as during the winding up. v As soonv as this takes placelthe rollers 4 can no longer rotate; but the roller 5 canwind u the blind 1 still farther, as the coupling-rolers 11 when the friction-disks 8 are turned in this direction enter into a widened part of the spaces 1() within the rollers 4, and thus uncouple the rollers 3 4. IDuring this movement of the curtain 1 independent of the curtain 2 the slit is closed,-.so that when the shutter is,

wound up again no light fallsu on the plate, u he working of the shutter it hasrbeen presumed -that the disengagmg-lever 32 is in the vposition shown in Fig. 1. If, however,the lever 32 is in the position shown in Fig.`2 in full lines, the curtains cannot, after being wound'up, when the button 33 is pressed roll off at once entirely, asinthis case the projection 34 on the .shaft of the toothed wheel 19 comes lintoen-` gageinent with the. disconnecting-lever 32, positiqn shown," full lines in Fig. 2 of the `i'aLtfingS-J where y the movement of the curtainsis interrupted." The projection 34 iss'o arranged V,that the interruptlon in the movement ofthe occurs at such a place that the shutter is just opened. It 'remains gpen as long as the button 33 is ressed down. hen the button 33 is release the curtain is ound ,oif entirel as described above. Ift e hand 37 is so a justed that the lever 32 is in the position indicated by dotted lines in Fig. 2, the curtain will -when the button 33 is pressed down roll offl again untill the projection 34 strikes against the lever 32-that is to say, until the shutter is opened. If now button 33 is released, lever 32 on its return into the position of rest engages the projection 35 of the toothed wheel 19, so that the shutter remains open until the button 33 is pressed upon again. According to the adjustment ofthe lever '32 the exposure will either be instantaneous, (the corresponding position of the hand 37 being indicated in F ig. 2 by the letterM,) aso-called ball-exposure, (indicated by letter 13,) or a prolonged ex posure, (indicated by letter T.) In order that if the lever 32is adjusted in a certain position the corresponding exposure will realljr follow, it is necessary that each time when the lever is put on ball or prolonged exposure the projection 34 is engaged by the lever. This is attaincdby the arrangement that the segment 31 is of the shape of an inclined surface with indentations and so arranged on thc face of the toothed wheel 19 that with its upper end it engages with the detent-lever 32, when the shutter is entirely wound up. Only a very slight lifting of the lever 32 is required in this ease in order to bring it into the path of the projection 34. The projection 34 can nevertheless freely p'ass overv the lever 32 as soon as the latter is released, as in the meantime the toothed Wheel 19, with the segment 31', has turned so far that the lower part of the range of teeth is underneath the lever 32.

WhatI claim as my invention, and desire to secure by United States Letters Patent, 1s

1. In a shutter the combination of two curtains adapted to be moved as well independently of each other as jointly, and adapted to form a slit, means adapted to succes-l sively interrupt the movement of the two curtains at the end of the winding-off move- `ment, means for limiting at the end of the winding-up movement at first the movement of one curtain and other adjustable means adapted to limit thereafter the movement of tlie second curtain at the moment when a slit of desired width has been formed.

2. In a vshutter Athe combinationl of two curtains adapted to form a slit between their edges, rollers allowing of moving the curtains to and fro, either independentlyof each other or jointly,- a bridge-piece adapted to communicate the movement of one roller of one curtain to one roller of the other curtain, coupling 'devices between said bridge-piece and said two curtain-rollers, one of said coupling devices being a. frictioncou ling and the otherbeing a couplingy which ocks on rotation in one 'direction and means for interrupting the movement of one curtain at IOO IDI'

the end of the windin-up and winding-0H l edges`,rol1ers adapted to move. thecurtains to and fro, .either independently of each kother or jointl', f, bridge-piece adapted to communicate t e movement of one roller of one curtain to one roller of the other curtain, coupling devices between said vbridge-piece and said two curtain-rollers, one of said coupling devices being a friction-coupling securing frictional contact between said bridge-piece and one of said two curtainrollers and the other, interposed between the lss bridge-piece and the second curtain-roller, a coupling which locks on rotation in one direction and means for interrupting the movement of thatv curtain-roller which is actuated 'during the winding-up movement by means of said bridge-piece and coupling devices, at the end of-the winding-up and Winding-off movement,` substantially as set forth.

4'. In a shutter the combination of two curtains, adapted to form a slit between their edges, rollers adapted to move the curtains to and fro, either independently of each other or jointl a bridgp/iecenavdapteil-tolV -conununicate--t evm'ovment of one roller of one curtain to one roller of the other curtain, coupling devices betweenv saidbridge-piece .and said two curtain-rollers, one of said coupling devices being. a friction-coupling and one a coupling which locks on rotation in one direction and means forinterrupting the movement of the one curtain at the end of the winding-up and Winding-off movement, and adjustable means for interrupting the winding-up movement of the second curtain after`the interruption of the movement of the said first curtain, substantially as setto automatically uncouple the same, when" .they move in the other direction, and means for stopping the two rollers on the ends of the shaft, at the termination of the winding-up or winding-off movement of the' curtains.

6.- In a shutter the combination of two `'curtains adapted to form a slit between them,

rollers adapted to move the curtains to and fro, one roller of one curtaincarrying loosely' at both ends of its shaft, rollers for the second curtain, each of the two last-named rollers containing a cavity, friction-bodies within such cavities loosel mounted on the ends of the shaft and in ction contact with the first-named middle roller the friction-bodies and the bodies of the curtain-rollers 'inclosing same leavingy hollow spaces between them,4

coupling-bodies in these hollow spaces, 'adapted to couple the friction-bodies Yranrcldtllevr rollers automatically, onmoving in one direction and to uncouple them, on moving in the opposite direction, means' adapted to stop the said twol hollow rollers at the termination of the winding-up and winding-off movement of the curtains, and adjustable means for interrupting the winding-up movement of the roller between the said twoV rollers, after the stopping ofthe latter.

7. In a shutter the vcombination of-.two

curtains adapted to be moved independently of each other as well as jointly, and forming ,a

slit between them, means adapted-to interrupt the movement of one curtain at the termination of the winding-up and winding-off movement, a lrotatable member carrying a erative connection with the second curtain and an adjustable.membencarrymg also a :"stoj'jilpii, tlie"lstnamed stop-pin crossing the path A,of the stop-pin of said rotatable member.

8. In a shutter the combination of two curtains adapted tosbe moved independently ofveach other as well as o'intlyv and forming a slit between them, means adapted to bring the curtains into operative position by winding up for making exposures andYA to secure them in this position, other 'means forreleasing the curtains the meansv for bringing the curtains into operative position and for securing them when wound up, comprising a rotating handle, a toothed Wheel rigidly connected with said handle and in operative connection with the curtain, a toothed segment on the front side of the said toothed wheel and a detent-lever adapted to engage wi'thv the teeth of the said segment.

9. In a shutter the combination of two curtains adapted to be moved independently of each other as Well as jointly and to form a Aslit between them, means adapted to bring the curtains into operative position by Windingup for making exposures and to secure them in this position, other means for releasing the curtains, the means for bringing the curtains into operative position and for securing them when wound up, comprising a .85 stop-pin said rotatable member 'beinfgin 'opvr/ IOO IIO

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rotating handle, a toothed Wheel rigidly connected therewith and in o erative connectionwith the curtains, a toot ed segment on the front side of said toothed wheel, the teeth of said segment increasing in length from one end toward the other, two projections in lixed positions with relation to thetoothed segment, both at a smaller distance from the axis of rotation of the toothed segment than the latter and one of the two projections nearer to this axis than the other, and an adljustable detent-lever adapted to be approached more or' less to the axis of rotation the toothed segment only or, at the same time, into the path of one ofthe projections or of both, substantially for-the purpose set forth.

10. In a shutter the combination of two curtains, spring stretching' mechanism for said curtains, winding-up mechanism for said curtains, means for operating the winding-up mechanism of ithe two curtains together, and automatic ymeans for stopping the operation of'the winding-up mechanism of one curtain While permitting further operation of the winding-up mechanism of the other curtain.

11. In a shutter the combination of two curtains,spring stretching-rollers for moving said curtains m one direction, winning-up rollers for moving said curtains in the opposite direction, clutch mechanism for causing. the simultaneous movement of the Windingup rollesIofnthe two curtains, means for stopping the movement of one curtain before the other, Vand'adji'istable means for regulating the extent of movement of one curtain afterthe other has stopped, whereby to control the 'size of tha-opening formed between the vtwo curtains.

12. In a shutter the combina-tion of two curtains, spring-stretching rollers for moving said curtains in one direction, Winding-up rollers for moving said curtains in the opposite direction, Winding means acting upon the roller of one curtain,` friction clutch means for transmitting the motion of the roller of the first curtain to the rollers of the second curtain, means for stopping the movement of the second curtain at a predetermined point in either direction, adjustable mechanism acting on said winding means for regulating the extent lof movement of the first curtain lafter the second curtain has stopped, and an adjustable releasing member for securingy di'erent exposures in the camera.

In testimony whereof I have signed this specification in the presenceof two subscribing Witnesses.

ERNST BRAUBURGER.l

Witnesses:

WoLnnMAR HAUPT, HENRY IfIAsPER. 

